Ricoh FAX2500L SPECIFICATIONS 4500 u

RICOH FAX 4500L

SERVICE M ANUAL

DANGER

INVISIBLE LASER RADIATION

WHEN OPEN AVOID DIRECT

EXPOSURE TO BEAM

CAUTION

LASER RADIATION WHEN
OPEN AVOID EXPOSURE
TO BEAM

VORSICHT

UNSICHTBARE LASERSTRAHLUNG,
WENN ABDECKNG GEOFFNET
NICHT DEM STRAHL AUSSETZEN

CONTENTS

1. OVERALL MACHINE INFORMATION

1.1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . 1-1

1.2. FEATURES . . . . . . . . . . . . . . . . . . . . . 1-2

1.3. COMPONENT LAYOUT . . . . . . . . . . . . . . . . 1-5

1.3.1. Mechanical Components . . . . . . . . . . . . . . 1-5

1.3.2. Drive Components . . . . . . . . . . . . . . . . . 1-7

1.3.3. Electrical Components . . . . . . . . . . . . . . . 1-9

1.4. OVERALL MACHINE CONTROL . . . . . . . . . . . . . 1-13

1.5. VIDEO DATA PATH . . . . . . . . . . . . . . . . . . 1-14

1.5.1. Transmission . . . . . . . . . . . . . . . . . . . 1-14

1.5.2. Reception . . . . . . . . . . . . . . . . . . . . 1-14

1.6. POWER DISTRIBUTION . . . . . . . . . . . . . . . . 1-15

1.6.1. Distribution Diagram . . . . . . . . . . . . . . . . 1-15

1.6.2. Memory Back-up Circuit . . . . . . . . . . . . . . . 1-16

2. DETAILED SECTION DESCRIPTIONS

2.1. SCANNER . . . . . . . . . . . . . . . . . . . . . . 2-1

2.1.1. Mechanisms . . . . . . . . . . . . . . . . . . . 2-1

1. Document Detection . . . . . . . . . . . . . . . . . 2-1

2. Pick-up and Feed . . . . . . . . . . . . . . . . . . 2-2

3. Manual Feed . . . . . . . . . . . . . . . . . . . 2-3

2.1.2. Video Data Processing . . . . . . . . . . . . . . . 2-4

2.2. PRINTER . . . . . . . . . . . . . . . . . . . . . . 2-5

2.2.1. Mechanisms . . . . . . . . . . . . . . . . . . . 2-5

1. Master Unit . . . . . . . . . . . . . . . . . . . . 2-5

2. Charge Corona Unit . . . . . . . . . . . . . . . . . 2-6

3. Laser Optics . . . . . . . . . . . . . . . . . . . . 2-7

4. Development . . . . . . . . . . . . . . . . . . . 2-8

5. Paper Feed . . . . . . . . . . . . . . . . . . . . 2-12

6. Transfer Corona Unit . . . . . . . . . . . . . . . . 2-21

7. Fusing Unit . . . . . . . . . . . . . . . . . . . . 2-22

8. Cleaning . . . . . . . . . . . . . . . . . . . . . 2-23

9. Quenching . . . . . . . . . . . . . . . . . . . . 2-24

2.2.2. Circuits . . . . . . . . . . . . . . . . . . . . . 2-25

1. Laser Diode . . . . . . . . . . . . . . . . . . . . 2-25

2. Fusing Unit . . . . . . . . . . . . . . . . . . . . 2-27

2.3. PCBs AND THEIR FUNCTIONS . . . . . . . . . . . . . 2-29

2.3.1. FCU . . . . . . . . . . . . . . . . . . . . . . 2-29

2.3.2. MBU . . . . . . . . . . . . . . . . . . . . . . 2-31

2.3.3. SBU . . . . . . . . . . . . . . . . . . . . . . 2-32

2.3.4. OPU . . . . . . . . . . . . . . . . . . . . . . 2-32

2.3.5. LDDR . . . . . . . . . . . . . . . . . . . . . . 2-33

2.3.6. PFU . . . . . . . . . . . . . . . . . . . . . . 2-33

2.3.7. NCU . . . . . . . . . . . . . . . . . . . . . . 2-34

2.3.8. PSU . . . . . . . . . . . . . . . . . . . . . . 2-35

3. INSTALLATION

3.1. CONNECTING UP THE MACHINE . . . . . . . . . . . . 3-1

3.2. INSTALLING ADDITIONAL UNITS . . . . . . . . . . . . 3-2

3.2.1. Lower Cassette . . . . . . . . . . . . . . . . . . 3-2

3.2.2. Memory Card . . . . . . . . . . . . . . . . . . . 3-6

3.2.3. Cassette (250 Sheets) . . . . . . . . . . . . . . . 3-7

3.2.4. Cassette (500 Sheets) . . . . . . . . . . . . . . . 3-8

3.2.5. Handset . . . . . . . . . . . . . . . . . . . . . 3-9

3.2.6. Hard Disk . . . . . . . . . . . . . . . . . . . . 3-10

3.3. INITIAL PROGRAMMING . . . . . . . . . . . . . . . 3-12

4. SERVICE TABLES AND PROCEDURES

4.1. SERVICE LEVEL FUNCTIONS . . . . . . . . . . . . . 4-1

4.1.1. Bit Switch Programming (Function 01) . . . . . . . . . 4-1

4.1.2. System Parameter List (Function 02) . . . . . . . . . . 4-2

4.1.3. Error Code Display (Function 03) . . . . . . . . . . . 4-2

4.1.4. Service Monitor Report (Function 04) . . . . . . . . . . 4-2

4.1.5. Protocol Dump (Function 05) . . . . . . . . . . . . . 4-2

4.1.6. RAM Display/Rewrite/Printout (Function 06) . . . . . . . 4-3

4.1.7. Checking the Counters (Function 07) . . . . . . . . . . 4-4

4.1.8. Clearing the Counters (Function 08) . . . . . . . . . . 4-4

4.1.9. NCU Parameters (Function 09) . . . . . . . . . . . . 4-4

4.1.10. Modem/DTMF Tone Tests (Function 09) . . . . . . . . 4-5

4.1.11. Operation Panel Tests (Function 10) . . . . . . . . . . 4-5

4.1.12. Scanner Tests (Function 11) . . . . . . . . . . . . . 4-6

4.1.13. Printer Tests (Function 12) . . . . . . . . . . . . . 4-6

4.1.14. RAM Tests (Function 13) . . . . . . . . . . . . . . 4-7

4.1.15. Service Station Telephone Number (Function 14) . . . . . 4-7

4.1.16. Serial Number (Function 15) . . . . . . . . . . . . . 4-8

4.1.17. File Transfer (Function 16) . . . . . . . . . . . . . 4-8

4.1.18. Hard Disk Initialization (Function 17) . . . . . . . . . . 4-8

4.1.19. Group 4 Communication Parameters (Function 18) . . . . 4-8

4.2. BIT SWITCHES . . . . . . . . . . . . . . . . . . . . 4-9

4.2.1. Bit Switch Definitions . . . . . . . . . . . . . . . . 4-9

4.2.2. Default Settings . . . . . . . . . . . . . . . . . . 4-21

4.3. NCU PARAMETERS . . . . . . . . . . . . . . . . . . 4-22

4.4. DEDICATED TRANSMISSION PARAMETERS . . . . . . . 4-29

4.4.1. Programming Procedure . . . . . . . . . . . . . . 4-29

4.4.2. Parameters . . . . . . . . . . . . . . . . . . . . 4-30

4.5. SERVICE RAM ADDRESSES . . . . . . . . . . . . . . 4-33

4.6. SPECIAL TOOLS AND LUBRICANTS . . . . . . . . . . . 4-36

4.7. PM TABLE . . . . . . . . . . . . . . . . . . . . . 4-37

5. REPLACEMENT AND ADJUSTMENT

5.1. COVERS . . . . . . . . . . . . . . . . . . . . . . 5-1

5.2. ADF/SCANNER . . . . . . . . . . . . . . . . . . . 5-2

5.2.1. Document Feed, Pick-up, and Separation Rollers . . . . . 5-2

5.2.2. Separation Roller Adjustment . . . . . . . . . . . . . 5-3

5.2.3. Document Table Adjustment . . . . . . . . . . . . . 5-3

5.2.4. Xenon Lamp . . . . . . . . . . . . . . . . . . . 5-4

5.2.5. Xenon Lamp Driver . . . . . . . . . . . . . . . . . 5-4

5.2.6. Tx Motor . . . . . . . . . . . . . . . . . . . . 5-5

5.2.7. Timing Belt Tension Adjustments . . . . . . . . . . . 5-5

5.2.8. SBU . . . . . . . . . . . . . . . . . . . . . . 5-6

5.2.9. SBU Adjustments . . . . . . . . . . . . . . . . . 5-6

5.3. CHARGE/QUENCHING . . . . . . . . . . . . . . . . 5-11

5.3.1. Charge Corona/Quenching Lamp Unit . . . . . . . . . 5-11

5.4. EXPOSURE . . . . . . . . . . . . . . . . . . . . . 5-12

5.4.1. Hexagonal Mirror and Motor . . . . . . . . . . . . . 5-12

5.4.2. Laser Diode Unit . . . . . . . . . . . . . . . . . . 5-12

5.5. PAPER FEED (UPPER CASSETTE) . . . . . . . . . . . 5-13

5.5.1. Upper Paper Feed Clutch and Rollers . . . . . . . . . 5-13

5.5.2. Upper Paper Feed Motor . . . . . . . . . . . . . . 5-13

5.6. DEVELOPMENT . . . . . . . . . . . . . . . . . . . 5-14

5.6.1. Development Unit . . . . . . . . . . . . . . . . . 5-14

5.6.2. Toner Metering Blade . . . . . . . . . . . . . . . . 5-15

5.6.3. Bias Brush and Development Roller . . . . . . . . . . 5-15

5.7. TRANSFER/FUSING UNIT . . . . . . . . . . . . . . . 5- 16

5.7.1. Transfer and Fusing Unit . . . . . . . . . . . . . . . 5-16

5.7.2. Transfer Corona Unit . . . . . . . . . . . . . . . . 5-16

5.7.3. Transfer Corona Wire . . . . . . . . . . . . . . . . 5-17

5.7.4. Fusing Lamp . . . . . . . . . . . . . . . . . . . 5-17

5.7.5. Hot Roller Strippers . . . . . . . . . . . . . . . . 5-18

5.7.6. Thermostat, Thermistor, and Cleaning Pad . . . . . . . . 5-18

5.7.7. Hot Roller . . . . . . . . . . . . . . . . . . . . 5-19

5.8. PCBs . . . . . . . . . . . . . . . . . . . . . . . . 5-20

5.8.1. FCU . . . . . . . . . . . . . . . . . . . . . . 5-20

5.8.2. MBU . . . . . . . . . . . . . . . . . . . . . . 5-21

5.8.3. PSU . . . . . . . . . . . . . . . . . . . . . . 5-22

5.8.4. NCU . . . . . . . . . . . . . . . . . . . . . . 5-22

5.8.5. Operation Panel PCB . . . . . . . . . . . . . . . . 5-23

5.8.6. Power Pack . . . . . . . . . . . . . . . . . . . 5-23

5.9. LOWER CASSETTE . . . . . . . . . . . . . . . . . . 5-24

5.9.1. Covers . . . . . . . . . . . . . . . . . . . . . 5-24

5.9.2. Paper Feed Motor . . . . . . . . . . . . . . . . . 5-24

5.9.3. Paper Feed Clutch and Paper Feed Roller . . . . . . . . 5-25

5.9.4. Pick-up Roller . . . . . . . . . . . . . . . . . . . 5-26

5.9.5. Separation Roller . . . . . . . . . . . . . . . . . 5-26

5.9.6. PFU Board . . . . . . . . . . . . . . . . . . . . 5-27

5.10. OTHERS . . . . . . . . . . . . . . . . . . . . . . 5-27

5.10.1. Ozone Filter and Ozone Fan . . . . . . . . . . . . 5-27

5.10.2. Toner Supply Motor . . . . . . . . . . . . . . . . 5-28

5.10.3. Main Motor . . . . . . . . . . . . . . . . . . . 5-28

6. TROUBLESHOOTING

6.1. COPY QUALITY TROUBLESHOOTING . . . . . . . . . . 6-1

6.2. MECHANICAL PROBLEMS . . . . . . . . . . . . . . . 6-12

6.2.1. ADF/Scanner . . . . . . . . . . . . . . . . . . . 6-12

6.2.2. Printer . . . . . . . . . . . . . . . . . . . . . . 6-15

6.3. SERVICE CALL CONDITIONS . . . . . . . . . . . . . . 6-19

6.4. ERROR CODES . . . . . . . . . . . . . . . . . . . 6-21

6.5. ELECTRICAL COMPONENT DEFECTS . . . . . . . . . . 6-25

6.5.1. Defective Sensor Table . . . . . . . . . . . . . . . 6-25

6.5.2. Blown Fuse Table . . . . . . . . . . . . . . . . . 6-26

OVERALL MACHINE INFORMATION 14th July, 1992
SPECIFICATIONS

1. OV ERALL MACHINE INF O R MATIO N

1.1. SPE CIFICATIONS

Type

Desktop transceiver

Circuit

PSTN, PABX

Connection

Direct coup le

Document Size
Length: 105 - 1200 mm [4.1 - 47.2 ins]

Up to 100 m [328 ft] after adjustment

Width: 148 - 304 mm [5.8 - 12.0 ins]
Thickness: 20 lb paper 0.05 to 0.2 mm

[2 to 8 mils]
Manual Feed 0.04 to 0.4 mm
[1.6 to 16 mils]

Document Feed

Automatic feed, face down

ADF Capacity

50 sheets (using 20 lb paper)

Scanning Method

Flat bed, with CCD

Protocol

Gr oup 3 with ECM, Group 4 kit a va ilable

Data Rate

14,400/12,000/9,600/7,200/4,800/2,400 bps;
automatic fallback

I/O Rate

With ECM : 0 ms/line
Without ECM: 5, 1 0, 20, or 40 ms/line

Transmi ssi on Time

6 s at 14,400 bps (G3 ECM) for a CCITT # 1
test document (Slerexe le tte r) using stand­ard resolution

Printing System

Las er printing, using the Ricoh CS (Compact
Seamless) Engine, plain paper, dry toner

Pap er Siz e
Standa rd Cassette: Letter, Legal
Lower Ca ssette: Letter, Legal, A4, B4

Maximum Printout Width

210 mm [8.3 ins]
250 mm [9.8 ins] if a lower cassette is in­stalled

Maximum Scan Width

256 mm [10.1 ins] ± 1%

Scan Resolution
Main scan: 200 dpi
Sub scan:

Standard 100 dpi
Detail 200 dpi
Fine 400 dpi

Memory Capacity
ECM: 128 kbytes (double buffer)
SAF: Base machine - 1 M byte (6 2 pages),

with optional extra 1 Mbyte or 2 Mbytes (max
123 or 185 pages respectively), or 20 Mbyte
hard disk (1,200 pages total)

Compression

MH, MR, E FC, MMR , SSC
Storage to SAF memory for tx: MH
MMR only with ECM

Modulation

V.33/V.17 (TCM), V.29 (QAM), V.27ter (PHM),
V.21 (FM)

Ma ximu m Printer Resolution
Main scan: 400 dpi
Sub scan: 400 dpi

Power Supply

115 ± 20 Vac, 60 ± 1 Hz

Power Consumption (Base Machine Only)
Standby: 35 W Tra ns mit : 40 W
Receive: 180 W Copying: 310 W

Operating Environment
Temperature: 17 - 28 °C [63 - 82 °F]
Humidity: 40 - 70 % Rh

Dimensions (W x D x H)

496 x 459 x 293 mm [19.5 x 18.1 x 11.5 ins]
Excluding handset, trays, and optional units

Weight

19 kg [41.8 lbs]
Excluding handset, trays, and optional units

1-1

14th July, 1992 OVERALL MACHINE INFORMATION

FEATURES

1.2. FEATURES

KEY: O = Used, X = Not Used,

A = W ith optiona l me m ory or hard disk only,
B = With lower cassette only,
C = With Group 4 kit only

Equipment

ADF O
Bar code reade r X
Built-in handset X
Cabinet X
Connection for ans. machine X
Connection for handset O
Cutter X
Handset (option only) O
Hard disk (option only) O
Magnetic card reader X
Manual f eed mechanism O
Marker O
Microphone X
Monitor speaker O
R emaining memory indicator O
Speakerphone X

Video Processing Features

Contrast O
Halftone (B asic & Error Dif f usion) O
MTF O
Reduction O
R e s olution O
Smoothing to 16 x 15.4 l/mm O

Communication Features - Auto

Automatic fallback O
Automatic redialing O
Confidential reception A
Dual Access O
Substitute r eception O
Transmission Reserve X

Communication Features -

User Selectable

Action as a transfer broadcaster A
AI Redial O
Alternative De stina ti on X
Answering machine X
Authorize d Reception O
Auto-answer delay time X
Auto dialing (pulse or DTMF) O
Auto Document X
Automatic Voice Messa ge X
Auto-note X
Batch Transmission (max 200

batches)
Broadcasting O
Chain Dialing O
Communication Result D isplay O
Confidential ID O v erride O
Confidential Transmission O
Direct F ax Number Entry O
Economy Transmission O
Economy Transmission Time O
Forwarding (5 stations) A
Fre e Polling O
Gr oups ( 10 groups ) O
Gr oup Tran sfer Station O
Hold X
ID Transmission Option O
Immediate Redialing O
Immediate transmission O
Key stroke Programs O
Mailbox X
Memory transmission (this is the

defau lt mode )
Multi-step Transfer O
Next Transfer Station C
Notify X
On Hook Dial O
Page Count O
Personal C odes O
Personal Codes with Conf ID O
Polling R eception O
Polling Transmission O
Polling tx file lifetime in the SAF O
Quick Dial (32 stations) O

O

O

1-2

OVERALL MACHINE INFORMATION 14th July, 1992
FEATURES

Communication Features -

User Selectable

Reception modes (Fax, Tel,
Reduction O
Remote control features X
Remote Transfer X
Restricte d Access (50 codes,

without ca rds)
Secured Polling O
Secured Polling with Stored ID

Override
Secure Transmission O
Send Later O
Silent ringing detection X
Speed Dial (100 stations) O
Telephone Dire ct or y O
Tonal Signal Transmission O
Transfer Request O
Transmission Deadline O
Turnaround Polling X
Two-step Transfer C
Voice Request (immed. tx only) O

Communication Features -

Service Selectable

AI Short Protocol O
Auto-reduction override option O
Bus y tone detection O
Closed Ne twork (tx an d rx) O
Continuous Polling Re ception O
Dedicated t x par amete r s O
ECM O
EFC O
Inch -mm conve rsi on O
MV1200 compatibility X
Page retransmission O
Page separation mark O
Protection against wrong conn. O
R esol’n stepdown ov erride option X
Short Preamble O
W ell log O

Auto) O

O

O

Other User Features

Area Code Prefix O
Auto Service Call O
Ce n ter mark O
Checkered mark O
Clea ring a memory file O
Clea ring a polling file O
Clock O
Confidential ID O
Copy m ode O
Counters O
Country code O
Destination Check O
Direct entry of names O
Function Programs O
ID Code O
Label Insertion O
Language Selection O
LCD contrast control Se rvice
Memory L ock A
Memory L ock ID A
Modifying a memory file X
Mu lti Sort Document Reception A
Multicopy mode A
Night Timer O
Own t elephone number O
Printing a memory file O
RDS on/off O
R eception M ode S witching Ti mer X
Reception Time (non-memory rx

only)
Re mote ID X
R everse Order Printing A
RTI, TTI, CSI O
Secure I D O
Speaker volume control O
Specified Cassette S election B
Substitute r eception on/off O
Telephone line type O
TTI on/off O
Use r Function Keys O
User Parameters O
Wild Cards O

O

1-3

14th July, 1992 OVERALL MACHINE INFORMATION

FEATURES

Reports - Automatic

Charge Control Report X
Communication Failure Report O
Confidential File Report O
Error Report O
Memory Storage Report O
Mode Ch ange Re port X
Polling Clea r Report O
Polling R eserve Report O
Polling R esult R eport O
Power Failure Report O
TCR O
Transfer Result Report O
Transmission Deadline Report O
Transmission Result Report O

Reports - User-initiated

Authorized Reception List O
Charge Control Report X
File L is t O
Forwarding List A
Gr oup List O
Personal C ode List O
Program List O
Quick Dial List O
Specified Cassette Selection List B
Speed Dial List O
TCR O
Transmission Status Report X
User Function List O
Use r Parameter List O

Service Mode Features

NCU parameters O
Operation panel test O
Printer mechanism test X
Printer te st patterns O
Progra mmable atten u ation X
Protocol dum p lis t O
R AM display/re write O
RAM dump O
RAM test O
R inger tes t X
Scanner la mp test O
Scan n er mechanism test O
Sens or initialization X
Serial number O
Service m onitor report O
Serv ice s tation numbe r O
Syste m parameter list O
Technical data on the TCR O
T h ermal h ead pa r ameters X
Transmission Status Report X

Memory Files

Max. number of files: 200
Max. number of stations/file: 200
Max. number of stations overall: 500
Max. number of pages overall: 1,200

Service Mode Features

Back-to- back t es t O
Bit switch programming O
Buzzer test O
Cable equalizer O
Comm. par ameter display O
Counter check O
DTMF tone test O
Echo countermeasure O
Error code display O
File Transfer O
LCD contrast adjustment O
Memory file printout (all files) O
Modem te st O

1-4

OVERALL MACHINE INFORMATION 14th July, 1992
COM PONEN T LAYOUT

1.3. COMPONENT LAYOUT

1.3.1. Mechanical Components

13

14

15

16
17

18
19

20
21
22
23

24

12

11

10

2

6789

45

3

1

32

31

30

25

26

27

1. R2 Rollers Feed the document through the scanner.

2. Exposure Glass E xposes the original to light from the xenon lamp.

3. R1 Rollers Feed the document through the scanner.

4. Se paration Roller All ows on e pa ge in t o t he scanne r.

5. Document Feed Roller Feeds the document into the scanner.

6. Pick-up Roll er Picks up pages of the document from the docum ent
table .

7. Toner Cartridge This s upplies toner to the deve lopment unit. It is part of
the CTM (Cleaning/Toner Magazine).

8. Charge Corona Unit This applies a charge to the master at the start of the
print cycle.

9. Quenching Lamp This remove s excess charge from the master at the end
of the print cycle.

10. Thermistor This me asures the temperature in the fusing unit.

11 . Hot Roll er Heat from thi s rolle r fuses the ton er to the copy pape r.

28

29

1-5

14th July, 1992 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

12 . Hot Roll er S tr i ppers These take th e paper of f the h ot roll er after f using.

13. Copy Feed-out Rollers T h ese feed the paper out of the printer.

14. Pressure Roller (Fus ing) This applies pressure to the paper during the fusing
process.

15. Cleaning Unit/Used Tone r

Tank

16. T ransfer Corona Unit This applies a charge to the paper to pull the toner off

17. Master Belt Also known as the CS (Compact Seamless) Engine. The

18. Registration Rolle r This carries out the registration process.

19. Registra tion S ensor This detects when paper is approaching the registration

20. Development Roller This roller applies toner to the latent image on the

21. Toner Supply Bar This feeds toner to the development roller.

22. Toner Mixing Bar This stirs up the toner in the deve lopment unit, so that it

23. Upper Relay Rollers The se feed paper from th e upper ca ssette in t o t he

24. Lower R elay R ollers These feed paper from the lower cassette into the

25. Lower Paper Feed Roller This feeds paper out of the lower cassette.

26. Lower Paper Separation

Roller

27. Lower Paper Pick-up Roll er Thi s picks up the t op sheet of paper from the stack in

28. Upper Paper Feed Rolle r s The se pick up the top sheet of pa per f rom the st ack in

29. Focusing Lens This focuses the laser beam onto the master belt.

30. Fθ Lenses These ensure that the thickness of the laser beam is

31. Hexagonal Mirror This passes the laser beam across the mas te r be l t.

32. CCD (Charge Coupled

Device)

This removes excess toner from the master after image
transfer and stores it. It is part of the CTM
(Cleaning/Toner Magazine).

the master and onto the copy pape r.

latent image is writte n to this organic photoconductor
belt.

roller .

master belt.

does not collect into lumps.

printer .

printer.

This ensure s that only one sheet of paper at a time
leave s the l ower cas sette .

the lower cas sette and passe s it to the feed roller.

the upper cassette a n d fe ed it into the printer.

uniform across the main scan.

This converts the light reflected from the document into
an analog v ideo sign al.

1-6

567

13

14

15

OVERALL MACHINE INFORMATION 14th July, 1992
COM PONEN T LAYOUT

1.3.2. Drive Components

18

2

1

3

4

8

9

17

16

19

12

20

10

11

1-7

14th July, 1992 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

1. Tx M otor This stepper motor drives the scanner.

2. R2 Roller This fe eds the original through the scanner.

3. Toner Supply Motor This dc motor drives the toner supply mechanism.

4. R1 Roller This fe eds the original through the scanner.

5. S h u tter Dri ve Gear This ensure s that th e shutter moves out of the
document feed path at the correct time.

6. Toner Supply Gea r (CTM ) This ens ures the supply of toner from the CTM into the
development unit. It is part of the CTM.

7. Clea ning Brus h Drive Gear T his drives the cleaning brush in the CTM.

8. Hot Rolle r This fuses the tone r to the copy paper.

9. Copy Fee d-out Roller This feeds printouts out of the machine.

10. Pressure Rolle r This applies pres sure to th e copy paper in the fusing
unit.

11. Regis tration Roller Drive

Gear

12. Upper Paper Feed Motor This dr ives the pape r fe ed mechanis m in th e upper

13. Development Roller Drive

Gear

14. Upper Paper Feed Roller

Drive Gear

15. Master Belt Drive Gear This drives the master belt.

16. Paper Feed Clutch This transfers drive from the upper paper feed motor to

17. Toner Supply Gear

(Development)

18. Main Motor This brushless dc motor drives the mas te r belt, fus ing

19. Lower P aper Feed Motor This drives the paper feed mechanism in the lower

20. Lower P aper Feed Clutch This transfers drive from the lower paper feed motor to

This drives the registration roller.

cassette.
This drives the deve lopme nt roller.

This drives the u pper paper f eed roller.

the uppe r paper f ee d m echanism.
This ensures the collection of toner from the CTM, a n d

its distribution across the full le ngth of the development
unit.

unit, development unit, and cleaning unit.

cassette.

the lower paper fe ed mechanism.

1-8

9

12

16

24

OVERALL MACHINE INFORMATION 14th July, 1992
COM PONEN T LAYOUT

1.3.3. Electrical Components

11

10

13

8

1

2

3

4

5

6

7

34

33

32

31

37

36

35

30

29

28

27

26

14

15

17

18

19

20

21

22

23

25

1-9

14th July, 1992 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

Lower Ca ssette

44

43

42

Name Description No.

PCBs

FCU This board controls the machine. 11
MBU This boa rd contains the s ys te m ROM and RAM for storing

system parameters such as bit switch settings and programmed

telephone numbers .
SBU This board contains the CCD. 1
OP-PO RT This board controls the ope ration pane l. 37
NCU This board conta ins relays and switches for interfacing the

machine to the network and the handset.
PSU This board supplies power to the machine. 3
LD Unit This board drives the laser diode. 10
PF U This board controls the lower pa per f eed unit. 44

MOTORS

Tx M otor This s te pper motor drives the s canner. 33
Main Motor This dc motor drives the fusing unit, maste r belt, dev elopment

roller, and cleaning unit.
Upper Paper

Feed Motor
Lower Paper

Feed Motor
Toner Supply Mo-

tor
Hexagonal Mirror

Motor
Ozone F an This removes ozone-laden air from the vicinity of the ma ster unit,

This stepper motor drives the upper paper feed mechanism and

the registra ti on roller.

This stepper motor drives the lower pape r f eed mechanism. 43

This dc motor drives the toner supply mechanism. 32

This high-speed dc motor drive s the hexa gonal mirror in the

lase r printer optics.

an d fil t ers out th e ozone.

38

39

40

41

12

31

30

26

13

5

1-10

OVERALL MACHINE INFORMATION 14th July, 1992
COM PONEN T LAYOUT

Name Description No.

CLUTCHES

Upper Paper
Feed Clutch

Lower Paper
Feed Clutch

SENSORS

Docum ent Sensor Th is dete cts the presence of a docume nt in t he feeder. 36
Scan Line Se ns or This detects when a page is approaching the auto shading

Document Width
Sensor

Toner Near-end
Sensor

Upper Paper Size
Detector

Upper Paper End
Sensor

Registration Sen­sor

Paper Feed-out
Sensor

Front Cover
Switch

CT M Sensor This detects when a C TM has been installe d in the ma chine. 27
Lower Paper Size

Detector
Lower Paper End

Sensor
Lower Paper

Feed Sensor

INT ERLOCK S WITCHES

F ron t Cove r Inter ­lock Switches

OTHERS

Spe aker This allows th e user to lis ten to the conditi on of th e tel ephone

Xenon Lamp This lamp illuminates the document. 34
Xenon Lamp

Driver
Charge Corona

and Quenching
Lamp Unit

Transfer Corona
Unit

Varistor This ensures that the charge given to the master by the charge

Marker This stamps a red circle on each page that is successf ully f ed

T h i s transfe rs drive from the upper paper fe ed motor to the

paper feed roller in the upper cassette.

T h i s transfe rs drive from the lower paper feed motor to the paper

fee d roller in the lower cassette.

position.

This detects when a B4-width [10.1"] or A 3-width [11.7"]

document has been placed in the feeder.

This detects when the toner has almost run out. 17

T h i s dete cts th e paper size ins talled in the upper cassette. The

use r mu st ins tall the correct actuator.

This detects when the paper in the upper cassette has run out. 29

This detects when paper has arriv ed at the registra tion rollers . 21

This detects when the paper has be en fed out of the printer . 24

This det ects whe t her the front cover is ope n or closed. 23

T h i s dete cts th e paper size ins talled in the lower casse tte. The

use r mu st ins tall the correct actuator.

This detects when the paper in the lower cas s ette has run out. 38

This sens or detects the presence of paper at th e low er paper

feed roller.

If the front cover is open, these interlock switche s inte rrupt the

+ 5VL D power s upply for th e laser di ode and the + 24VD pow er

supply for the powe r pack, motors, and oth er compon ents.

line.

This drives the xenon lamp. 2

The charge corona unit charges the ma ster belt at the start of

the print cycle . The quenching la mp removes excess charge

from the master belt at the end of the print cycle.

This pulls the toner off the maste r and onto the copy paper . 7

corona wire does not exceed -750 Volts.

through the scanner.

28

42

14

16

25

41

39

19,
20

35

18

9

15

1-11

14th July, 1992 OVERALL MACHINE INFORMATION

COM PONEN T LAYOUT

Name Description No.

Power Pack This su pplies high voltages to the corona wires and the

development bias termina l.
F using L amp This fuses the ton er to the paper. 6
Thermistor This monitors the te mpera ture inside the fusing unit. 8
Thermostat This inte rrupts the ac power supply to the fusing lamp if the

temperature exceeds 400 °C.
Lower Ca ssette

Indicat or Panel

T h i s contains indicators to show the status of the l ower cas sette. 40

22

4

1-12

OVERALL MACHINE INFORMATION 14th July, 1992
OVERALL MACHINE CONTROL

1.4. OV ERALL MACHINE CONTROL

HandsetLine

SBU

(CCD)

Scanner
Sensors

Operation

Panel

NCU

CONTROL SIGNALS

Video Processing

Memory

Video

Processor

Speaker

Modem

CPU

DATA AND ADDRESS BUS

PSU

Port

Scanner and Printer Drive
Components and Sensors

FCU

I/O

RS-232C

Interface

Laser

Interface

Page

Memory

SAF

Memory

ECM

Memory

RAMROM

MBU

Laser Diode Driver
Main Scan Start Detector
Interlock Switch

The cpu on the FCU board controls the machine, as shown in the above
drawing.

There is no modem board in the machine; the modem consists of a chip on
the FCU board that carries out all the analog and digital functions of a fax mo­dem.

1-13

14th July, 1992 OVERALL MACHINE INFORMATION

VIDEO DATA PATH

1.5. VIDEO DATA PA TH

1.5.1. Transmission

Original

Reference:

Group 3
Facsimile
Manual,
section
1-3-1

Xenon

Lamp

ECM

Memory

Line

Buffer

SAF

Memory

RAM

MBU

FIFO

Video

Processor

The fo llowing diagrams show
the data path for this model.

There is no pro­grammable resis-

CCD

Analog Signal

Modem

FCU

Network

(via the NCU)

tor in this model.

CPU

To the

1.5.2. Reception

From the

Network

(via the NCU)

Reference:

Group 3
Facsimile
Manual,
section
1-3-2

Line

Buffer

RAM

MBU

FCU

Memory

SAF

FIFO

Filter

HYBRID IC

Memory

ECM

Page

Memory

Laser Diode

Modem

CPU

Laser

Interface

Laser Diode

Driver

1-14

Copy Paper

OVERALL MACHINE INFORMATION 14th July, 1992
POWER DISTRIBUTIO N

1.6. POWER DISTRIBUTION

1.6.1. Distribution Diagram

Lower Paper Feed Motor
Lower Paper Feed Clutch

+24VD

AC Main

Power

Fusing

Lamp

PSU

AC Switching

Circuit

+24V

-12V

+24VS

+24VD

+5V

Scanner
Sensors

+5V

Operation

Panel

+5V

+24VD

Regulator

Regulator

+5V

+24VD

+5V

PFU

- 12V

+5V
+24VS

+24VS

+5V

NCU

FCU

- 5V

+12V

Sensors and

Indicators

FUSING UNIT

Thermistor

+5V

+5V

MBU

SAF Memory

+5V

SBU

+12V

+5V

Printer

Sensors

Front Cover

Interlock Switch

Front Cover
Microswitch

+5VLD

+5VLD

LDDR

Laser Diode

+24VD

Motors, Clutches, Lamps,
Marker, Power Pack

+5V

The laser diode is powered by a special + 5V supply, called + 5VLD.
There are two + 24V power supplies:

• + 24VS: This is always on when the main switch is on.

• + 24VD: This is interrupted if the front cover interlock switch opens.

There is no + 24VD activation signal fro m the cpu to the PSU.

1-15

RS-232C

Interface

14th July, 1992 OVERALL MACHINE INFORMATION

POWER DISTRIBUTIO N

1.6.2. Memory Back-up Circuit

Reference:

Group 3
Facsimile
Manual,
sect i o n 1-4-3,
Circuit type 1

+5V

Voltage

Detector

+24V

[A]

+5V

Switching

Circuit

Regulator

MBU

RAM

1-9

1-7

Battery

Switch

Battery

Switching

Circuit

FCU

17-9

17-7

Real Time

Clock

CPU

Memory
Monitor

SAF

Memory

[B]

Battery

The battery [A] on the MBU backs up the RAM on the MBU, which contains
system parameters. It also backs up the real time clock in the cpu. This bat­tery is not rechargeable. CN1-7 tells the cpu whether the back-up po wer
(CN1-9) comes from the battery or from the + 5V power supply.

There is no battery switch for the battery on the FCU.
A rechargeable battery [B] on the FCU board backs up the SAF memory and

the real time clock for 1 hour. While the main power is on, the + 24V supply
recharges the battery.

If there is data in the SAF memory, the rechargeable battery [B] also backs
up the real time clock, to preserve the MBU battery.

1-16

DETAILED SECTION DESCRIPTIONS 25th June, 1992
SCANNER

2. DET AIL E D SE CTION DESCRIPTIONS

2.1. SCANNER

2.1.1. Me chanisms

1. Document Detection

[A]

Document Table

Reference:

Group 3
Facsimile
Manual,
section
2-1-1.

[B]

• Th e scanner is A3-width [11.7"], with a B4 document width d e tector [A]

and an A3 document width detector [B] .

• The scanner contains a xenon lamp.

• There is a fold-down extension [C] to support long documents.

[C]

2-1

[A]

25th June, 1992 DETAILED SECTION DESCRIPTIONS

SCANNER

Shutter

[C]

[B]

Refere nce :

Group 3
Facsimile
Manual, section
2-1-1.

In standby mode, tab [A] r ests on cam [B]. When the tx motor starts, the mo­tor rotates forwards (white arrows), the cam lifts the tab, and the shutter [C]
rises. After the last page has been fed through the scanner, the tx motor re­verses (black arrows), the cam drops back to the standby position, and the
shutter blocks the scanner path again.

2. Pick-up and Feed

Drive Mechanism

[B]

Reference:

Group 3
Facsimile
Manual,
sect i o n 2-2-1.

[A]

[C]

This ma chine h as a Mechanical Clutch Me chanism. The tx motor [A] drives
the feed roller [B] and pick-up roller [C].

Resoluti on

Standard - Immediate transmission: The tx motor feeds the document at 200 lines per inch.

The video processor executes OR processing to convert the data into 100 lines per inch.
Memory transmission: The motor feeds the document at 100 lines per inch, and no OR proc­essing is ne eded.
Detail - The tx motor feeds the document at 200 lines per inch. There is no OR processing,
and the data is transmitted at 200 lines per inch.
Fine - The tx motor feeds the document and transmits data at 400 lines per inch. If the other
terminal cannot receive at this re s olution, alterna te lines of data are deleted, so the effective
resolution of the transmitted data is 200 lines per inch.

2-2

DETAILED SECTION DESCRIPTIONS 25th June, 1992
SCANNER

Jam Conditions

The cpu detects a document jam if one of the following conditions occurs.

• The scan line sensor does not switch on within 5 s of the tx motor start-

ing.

• The scan line sensor does not turn off after the maximum document

length has been fed since it turned on; this is 12 s (standard resolution),
24 s (detail), or 48 s (fine) for a 1.2 m long document.

• The scan line sensor switches on while the document sensor is off.

• The document width sensor switches on while the docum ent sensor is

off.

• The scan line sensor do es not turn on within 2 s of the end of stamping,

if the document sensor is on.

Separation

Reference: Group 3 Facsimile Manual, section 2-2-2

3. Manual Feed

[B]

[A]

The manual feed button [A] lifts the separation roller [B] out of the doc ument
feed path. There is no manual feed switch.

Reference: Group 3 Facsimile Manual, section 2-2-3

2-3

25th June, 1992 DETAILED SECTION DESCRIPTIONS

SCANNER

2.1.2. Video Data Processing

Output from the CCD

A

Auto Shading

Memory

WHITE

WAVEFORM

FEEDBACK

Reference:

Group 3
Facsimile
Manual,
sect io n 2-3.

DC

Filter

VIDEO

PROCESSOR

Corrected Data from the Auto Shading Circuit

Amplifier

Gamma

Correction,

MTF

A/D

Converter

Data Processing

Circuits

Halftone

Process

Edge

Detection

To the CPU

and Modem

Basic

EDGE

ELEMENTS

Peak
Hold

CORRECTED

DATA

Error
Diffusion
Halftone

Process

Comparator

Background

Detection

OR

Processing

Reduction

A

NON-EDGE
ELEMENTS

Reduction

Halftone

B

Process Selector

To CPU and Modem

2-4

Image/Text

Detection

B’

DETAILED SECTION DESCRIPTIONS 25th June, 1992
PRINTER

2.2. PRINTER

2.2.1. Mechanisms

1. Master Unit

This printer uses a "write to black" system, using negative toner.
The master unit contains a du rable OPC master belt. The expected lifetime of

each master unit is about 60,000 copies (this is the target value). Because of
this long lifetime, the user is not expected to change the master; there is no
Replace Master indicator.

The master belt does not have a bond seam, so no master home position de­tection is needed. There is also no master unit interlock switch; there is an in­terlock switch on the front cover.

[A]

[B]

The main motor [A] drives the master belt [B].

• At the start of printing, it turns on briefly and the master belt moves un-

der the quenching lamp to ensure that it is fully discharged.

• Then, when the fusing lamp is at the correct temperature and the page

memory contains a complete page of data, and the hexagonal mirror
motor is running at the correct speed, the main motor switches on
again.

• When the main motor is running at the correct speed, the laser diode

turns on for automatic power control.

Reference: Group 3 Facsimile Manual, section 4-1

2-5

25th June, 1992 DETAILED SECTION DESCRIPTIONS

PRINTER

2. Charge Corona Unit

[D]

[B]

[E]

[A]

[C]

The charge corona unit [A] gives a -750 V charge to the master belt. The
varistor [B] ensures that the charge does not exceed this value.

The connection between the power pack [C] and the corona unit is not bro­ken when the front cover is opened. However, the front cover interlock switch
cuts the + 24V power line to the power pack if the cover is opened.

The charge corona unit contains a wire cleaner [D].
The charge corona swit ches on at the same time as the laser diode starts its

power control procedure.
There is one o zone fan on the right hand side of th e machine. It sucks air out

of the machine thr ough the ozone filter, which is par t of the ozone fan assem­bly. The ozone fan switches on when a ringing signal is detected, and stays
on until the fusing lamp temperature falls back below 130 °C at the end of the
printing run.

The inset shows how the grid plate [E] connects to the varistor.

Reference: Group 3 Facsimile Manual, sectio n 4-2

2-6

DETAILED SECTION DESCRIPTIONS 25th June, 1992
PRINTER

3. Laser Optics

[E]

[F]

[B]

[D]

[A]

[C]

The optics are the same as in sect ion 4-3-3 o f the Group 3 Facsimile Manual,
except that there are two mirrors [A] at the "Second Mirror" position.

Other points to note are as follows:

• Th e focusing lens [ B] is a barrel toroidal lens.

• The shield glass [C] prevents toner from entering the laser optics area,

and may need cleaning occasionally.

• An optical fiber [D] passes the reflected laser beam to the main scan

start detector [E]. This detector is situated on the laser diode drive
board [F], unlike shown in the diagram.

• The strength of the beam is 0.436 mW at a wavelength of 780 nm.

• The dimensions of the dot on the master belt are 65 µm (main scan di-

rection) by 75 µm (sub-scan direction).

The charge on the exposed parts of the belt drops to about -150 V, while non­exposed ar eas remain at about -750 V.

The laser engine characteristics are as follows (refer to page 4-3-21 of the
Group 3 Facsimile manual for background).

• Motor speed: 9,267.7 rpm (G3 and G4 l/mm mode), 9448.8 rpm (G4 dpi

mode)

• Motor type: Hexagonal

• LD clock fr equency: 5.3311 MHz

• Time between main scan synchronization signals: 1.082 ms

• Number of dots per main scan: 5769

2-7